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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b716b2f5784030d71b7e8e5441ca65328d02e51bf4e30bfae56bbf5f656ca6' 
  AND token = '2qN+UptZMPBkNUCUrYHIE6vV65h8AuAx9wOS4/wn5U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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