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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf6e8ad882b9ce9e3576c7655a39e8584ede41b49070ba55e8743a6adb1fb0e' 
  AND token = 'jNaHSEsPgRaRnYqoi26Pgto0a771TbCkRvNv6bI0Y9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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