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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650ae366635c069cf8d26ab420d0715d0036ef0baf691a8d34697cbf076159e8' 
  AND token = 'sc0FQ4ASm/nhEm3TdtoerP/xFLmhar+Q0aJvF8ug8Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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