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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b3cfa9536c0a6f3d3bf1acc65a88331f760865bcf2167ba29a0a31311d6e61' 
  AND token = '9bnm9imR/Edkb9NGxwIwG9ShmBCPHtokN22V0jfN19M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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