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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36be5b5e7b271d33a5c230439ab01d2a6b8bd4f4360af457289827199f982848' 
  AND token = 'N48Mu/CzcCW7JcXDSs3b5iHA9+lM0XWzzU2mmdvYH1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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