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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d904d9fae806b0af388ae14f51aaea6ab85e810cd890f44a3b7566a26cff65' 
  AND token = 'ovvy7yWUtDwkcZWkdyGASN9MzOertLV2OcL5aeAbNFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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