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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fb2f27bbd3cb7a664250e043f42842d8f7e4ebc0c6ba353af3e6cc0fdc1de5' 
  AND token = '4ypHMkIJsrqIcUwi1U0X0Ge0mZ+YP87VbGVQFHlyOh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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