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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c6668fd24fe4e93239f5ae297e4225d82e8d9962dc768b1d7e8498ab3ffb3d' 
  AND token = 'usB/bah9JXMr9UjUJalwkBKCuhOYwG9PNSeyHleHaoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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