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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7392c022d9ca500766bb1d6af0b9e8e30fd1e6c92ed21ad5ab109a4f1883e0' 
  AND token = 'xP40t/XEQc4g/vkaueZOILuJmSTdWLcyxoBgX1twnM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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