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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e198672cfacca8b6203ec994f9e1b55b067ba12d9a9b4b300cfc4eecd4d9baea' 
  AND token = 'iVZolXeEiI4FEVbvSc0FdJDSMJE3F8+SNeHXdr6DOy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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