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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c8d706e62afced3b4bc604c29174e84d0eb4edd58b95d7ab5d923a44319a5b' 
  AND token = 'Ee5u6/q2usLqdhl+j/5OjkeEgnQdHI97of3L0w+WS+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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