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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d4ea9125863a87e2b5c76b6925f261e343ade024f772f7ef7f93bc3ddf3646' 
  AND token = 'yjFCquopaBgErlzQl7CMVyJyucjJyQdwoGtwVoZnekc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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