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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dfc301f99d3b27a62569921cd7393957ee16adeedb2d9340f65e8c4ecff9ad' 
  AND token = 'yf41D/teTOVdG3eycv6y1Dr6Oefrxi5sq2Q1RqucjM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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