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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae90495c0a3193ab534dced4160d883cbd0dabc749e0a2c58d103d0972983ea6' 
  AND token = 'Xgre7AyA8qI8AYAG6YvaCSg0dvCmSLsH2CqiJKoKDwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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