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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd8989be3bcbb4cbd96d972ec6f9dbd430b803b745c9ab86acc280406cee85e' 
  AND token = '0YyRs0O9+bL1J6Nf6CW7Xom9Y6Hp27z0KhqxcJzrIf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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