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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cf5a7fdbc1baa6b5ca9355423fc88be931b57f7921f9d0dfe913ad85218815' 
  AND token = 'jI+v4G+MbTFE6AOteWmTbipIjw44DkMddFZJGP1yDVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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