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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6626f92282cc97910ed78598272eb197a9d0ae4993c334de2d3547c563517cf' 
  AND token = '9OpZsQU52xqaujTlKv6mck4FAnSOXCG0qeKRkfxQU0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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