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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a514e5156ff449e126f73b3524f3156c9da010d683c4b12cf34e6621c8dce9' 
  AND token = '1jYVbaADnlIPH21XKUvsj0/hY6xNk5MhxHBE5Dpb+Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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