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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8bedea07d7438f7b501f1ec3b9e5da61c4d88c826e1998cbf552dce972c737' 
  AND token = 'If07uy5VtdSaHPGY3YrTVKxFN6ws/KosexoIM7u1+2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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