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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09d47451e5e64454a333d790776c21f78f6cdcc557867ad8cc0604e997ca11a' 
  AND token = '5cShCiBngDKh0zLsMweNn/MbgS6WEXnNc/DMKD3XRvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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