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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb9c70f49bfb8767e6d54eccf7a1f2547390bbb2ad3cc32d1f93bf46928ca68' 
  AND token = 'G26fSF/NiXN7F7xbC5wBNsYizUcqUk6ton4StDeznm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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