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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc14ddce8c46e8c5dd6e8eb06219536cf53d647e85206029ca2bf0d7fac8935' 
  AND token = 'FyXH9QS6qtNRQYgvL0ITTMlH4bMgi/zkCl0uN7twwhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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