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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffc414664bc1954e127ca5d92c14128cdf1a4e3d67e9200ee7ece502d842821' 
  AND token = 'VJNalv06ReV8Uo4SGLqDT7HlfPI3LrNc1TZTcwVdjC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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