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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487dcd5121d08f63e81ee7b57b75fb751c2cce1bac084198d86ccba28205079b' 
  AND token = '24iQ9Q/jqzvkdHKP1jJcRbMSUARuy9iUZtkIdsyxC7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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