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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491916586c337e207678ac90ef3149dc2adf790fddf6fae4ce61e5ec73afd804' 
  AND token = 'U4ggsnudszQj9K4wLzbcfVNiTD4P9ZxVCG7FiEjF7yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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