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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bddd9220d811fcb263cf91775bb5d86789e2e9b8bc176bceb26d92fcdc003f' 
  AND token = 'mcAb3onKAjwtMb6cGEqQH05u7n2el+WCeF0WCvloWzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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