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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb3d1b7d9e442a062614820d7b65634987b6c5374d0cca9af215eba987c375c' 
  AND token = '4fIMBe5Ucgq538348hNljOXbhWSu683INzacHrSq9Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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