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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965ceb08120126a972093c7636e7eb8ece0c9b51cd3383db2d72d55fc9edeb44' 
  AND token = 'dMH3ZTJpWnC7Bm2BHbjdAuVobXRQiaBbo73YPAHBy4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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