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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debdf3a16365e25c00dd71b2e038d70207c602066e660a339d01ecf08168b4e4' 
  AND token = 'BqQRz8w2ZeNSaQ1SEyGPKu25pMGQjt+lJaotWUwH8sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}