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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a37c7ac5fd30e57c4c1e1bce880f6128653655698cbe98dbde9d1864f86baf' 
  AND token = 'KEO2zhethYryuoCLcC8YtmIPY/An6N1WWcnsy1WEYS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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