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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34267ae844b51e0cf758516bfafcded5895ef04ed4b6409eb94b10af30dafa65' 
  AND token = 'YcbYHSm7TleJ/W5WdosgrJAUKj2t/o/GnZJCS0GJPjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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