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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71355dc3611cf214988fe290a6ef9582dad91418e8594e3b94722e7ddbcb28c5' 
  AND token = 'qEUOb5sw5PwKyKZjqtIxlZQxZQ8A6gs0RNaEMBouYYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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