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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee429b87ded46943556d192ee040829c465126054f4fe66607f505381dc111c' 
  AND token = 'IPWTp9lWHApaK3+VNkRnE7Y6csp9oRrA36qJnm8OjK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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