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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da6bf3fc8a99529f1604756887fc744f957ca0e1900b3a95ac0fc469b7ae87e' 
  AND token = 'Vy7YbCZU7Eiw3R/UD9ygtPI60Wq+sUVhdcsDncxlXK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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