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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bba83afc5b7d6dbb2bd9033f9c026b34746b72873957839248e4ec1f83ebb1b' 
  AND token = 'zyZPA40S08BuZxM5YSh+hHYaaMODSTRZPZnuxRL8jkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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