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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7519a890ea742bf7827ca93a797f6d1a3d4b47d23059e6e01f0ead10af2bf7ff' 
  AND token = 'MlT7I7bpI4e8gXhxMRj9kAEQmxWphpYai4kpnio91IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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