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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49396d9905171d9357ab3bdce881be53f5c54a7efba6b566d8ab0ac674e42119' 
  AND token = 'q07e+xe8krmLko/Tp7qzqbnmp9/cYM6b/iclicUtaAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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