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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a75b1400fd2a55b6433f0999849bb6a255c75537a39520a989c98a6fbe38d8' 
  AND token = 'RqbDvrseORU4hDtJ25uJjskWk+sD4F2YCzdT1lRuum8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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