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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6c2065f84c7b38082b455a5110b174c83bf3724c5feea0282acedee0eab73f' 
  AND token = 'Q5PqMovovEintRFrcr5qNQAj9KMmpiBYUdbxeggSpyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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