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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfe18992e46c4e184fafa145dae84613e15fe5c644d4fe5c8793ff6352b6623' 
  AND token = 'rTcUPk6ePJaNlB6u0BFPnfxabP6l/PLZu/uIQiEB4HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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