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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8def7c1c78cd8b82e3c1cd3cad8a3218ed8b10ae3d0a37bda7d4378bd3acb18' 
  AND token = 'U52TxPC8l27QNZXCvPkR8/hjjL+wxvve6GaetgamsOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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