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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbf9bf2d8b992115ec175d07d0396b9c32d7e1aff7fa15f8cccd5acceb90f45' 
  AND token = '+Ha6tEZU7PfQGJlvo3h2aDuhYiWeP4IsN6wePeLDfa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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