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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670d2c4a09f69c697759bc1eb79ee26bb1de765681797e1c27e763eea572db51' 
  AND token = 'LZMMpkvVCSXdISjZmyd+m7XXyfXAN3YoWTVqjxVKnb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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