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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c6068106c029a720d109d9f0f9175f0c1b6cecc4e04411f512b400ccd77b8e' 
  AND token = '66ZGMG5OPcWLRXCfDFM1Toq8K+ky9iSjFnNyzMHnT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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