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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f623d64c168c494827f5536968a0f5b486b2c9161c52f2a307ded9c18cd1509c' 
  AND token = 'XgvIgSBpKeN9rQtIzym0lcD1M1cmVM+qKLiOK+16k7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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