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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d17f9f82a16d337fca227dc13cde5c82dea0a7dddd53a72654696cb1d65a5f2' 
  AND token = '3i9mCuzO+1Mh4/SH7zEMZl0N8UKqgxaNXLKAKXQcuns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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