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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47395a5396a1abb5966d51cbe948c3cc67a20c17000d6212e69f5080aa34ef5b' 
  AND token = '2yJfFXxG9uLLB1v+Pd0mtbL4dXYn8vRoyo8d9Y1QDPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00616

JSON explain

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