SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211ec5d15d28bbdeac71ae1d28a99f3a241b891839d1d29c8d97fba9d5466836' 
  AND token = 'eIUkMkhuPqpJRKKB4H0NEnKzzk2XkXWywDsACyeRQ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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