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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b1c019c9024c0ed894673a926207bf3bb3c6985ee2da1e9e867bcd5dacb1df' 
  AND token = '+8xdTsmmXExdgv31MPiKvu/m3zNYYmBGTtA/e7argog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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