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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484882992d4d4e2afff4017eeee5ffbca441dc5362f0a6edc017b55b3657ece6' 
  AND token = 'ncEnUN2dbPdDvDUtfGXLoh303sqyOfTSQ6ALp2pPsOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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