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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0913f7fa9ed139491f36a09b805bde778d2bccd3c7661a159bc33b7ab7af1d9a' 
  AND token = '5DWNzUurDsaXY8eoH8i2TnOxLKFcAWBkH0sxomf8bys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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