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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d95571ac6d13b4057b1a3d3f380541a9bbd110afa9555f4e0181e299903389' 
  AND token = 'cDe61GbiFreXFPtB1fg/WdWC6D2bTDH3ws4/K/hkaO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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