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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fa120c8293f2bf79c789e39cae017510f1a5573b5cd82c88cb7ef0e7698e2a' 
  AND token = 'IxcxmDej4kK4S/R6HTldnQR3R6n+FeWKjS+IxkkJoiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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