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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7afc92ed9c579ab242c30645ce9987872210d1e22009cf9638155342f400845' 
  AND token = 'OtPvICbL4yfWipPnOxHCu4iOjfE2kzPcWnYVE5DlcdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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