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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd8e766722b69edb25cd788b6e7d43d5bc4999e138290ed1d3ad8d1adc2e75c' 
  AND token = '4i3O2t2KeeoUwGh69uiFytiBoukKe3v4Dgh4FL/zbm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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