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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d029ffe6ab23b37d40f7639111fcdaec7913d7ca8d1e0e0b8dd8e1074d28ae' 
  AND token = 'x+n7d/hZn76iQ2bWTptTaCnUum6WR6UD/pcy/mqqgb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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