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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bfbb5cbaaf85f1e2a6a7607e4e4f000414f168dc1e57c900f7c64a3b975a63' 
  AND token = '7LrVPvJXPeMkdG1FRxp2Co7roW2Mzgb3AVE9noGRzX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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