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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1b6c95603631f601a0fbe15a347b005ca7201f78d4b3858b537ebced751736' 
  AND token = 'zOsPOdj4nsyhtIA9w+tjH63QNNeWhe/RAM5snYGJ0rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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