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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8025c56706354eb45b11f2b29e7a237688a181e0efa8ac7704dce267bca331f6' 
  AND token = 'vLumsuVRkMCnt5Bkew6zxK52Ybyq3Dn8g4nN5EPr1Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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