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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9b7f9e7bcb88e36bf7b18a0a1d0c6cce6cc901ac607f9bbb8c82ea2f677b31' 
  AND token = '8Amj91gxoJHdmlkmeWmA+8uzPhh1GuCWMgrHLIQVK6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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