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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea40c7e5d362bddee87e6faa9e212d0c8c51e1834b3e67d90f0924a3bf69ce57' 
  AND token = '2P6nCjEtKwPPQjfurZ1BI3GoZDDWJKqKLPWlf37Sknc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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