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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65c0482211e166f70af8ad05bcfa1c17e53ebd99b6066f837b61eb5f1f997af' 
  AND token = 'ZJhf0sdtiL8z56XPLiunc+QzjeS6zSGByzfNspBnUcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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