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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94d4ed56313e257037ef61f8fc7b327e89accb3ee01e0a1a0f513487e23d720' 
  AND token = 'qCjfHQp5DC2q+DIhcdVh+gY2RzLVX8oC/2IdSmU3juY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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