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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946744bb5a806ff0b0c0bdd8f4596c4b4fcc3557d227ae45f07d85a4961a669b' 
  AND token = 'Z5G0/+avFmvztkHSxWQbDr5buTQtj8vlDuf/n2vuoBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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